NAD T 754 User manual

NAD
SERVICE MANUAL
T 754
T 754
Surround Sound Receiver
Surround Sound Receiver
DRAFT DATE: 08 MAY 2007

2
SAFETY INFORMATION
AH VERSION
C VERSION

3
SERVICE SAFETY PRECAUTIONS
1. Replacing the fuses
CAUTION:
FOR CONTINUED PROTECTIONAGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF
FUSE.
Reference Designator Database Part Number Description
F751*AH 20-001-0078-90 FUSE TIME-LAG 10A/250VAC 5X20mm
UL/CSA 5T
F751*C,CT 20-001-0069-90 FUSE 800mA 250V TIME LAG LBC
5x20mm 5T UL/CSA/VDE/SEMKO
F752*AH 20-001-0076-90 FUSE 1.6A 250V TIME LAG LBC
5x20mm 5T UL/CSA/VDE/SEMKO
F752*C,CT 20-001-0072-90 FUSE TIME-LAG 6.3A/250VAC
5X20mm VDE/UL/CSA 5T
NOTE: <*AH > : USA, CANADIAN MODEL ONLY.
<*C, *CT > : EUROPEAN MODEL ONLY.
2. Safety check out
(Only U.S.A. model)
Before returning the product to the customer, make leakage current or resistance measurements to determine
that exposed parts are acceptably insulated from supply circuit.
CONTENTS
DESCRIPTION PAGE
SPECIFICATIONS............................................................................................................................ 4 - 5
REAR PANEL / FRONT PANEL VIEW .................................................................................................. 6
DISASSEMBLYINSTRUCTIONS .......................................................................................................... 7
WIRINGDIAGRAM......................................................................................................................... 8 - 10
BLOCKDIAGRAM................................................................................................................................11
SPECIALFUNCTION .......................................................................................................................... 12
DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING .................................................... 12
ADJUSTMENT POINTS DIAGRAM /AMPLIFIERADJUSTMENT ...................................................... 13
PCB LAYOUT ............................................................................................................................... 14 - 29
SCHEMATICDIAGRAM ............................................................................................................... 30 - 46
ICBLOCKDIAGRAM ................................................................................................................... 47 - 54
EXPLODEDVIEW............................................................................................................................... 55
EXPLODED VIEW PARTS LIST................................................................................................... 56 - 58
ELECTRICALPARTS LIST .......................................................................................................... 59 - 73
PACKINGDIAGRAM .......................................................................................................................... 74
Parts marked with the symbol are critical with regard to the risk of fire and electric
shock. Replace only with parts recommended by the manufacturer.

4
SPECIFICATIONS
POWER AMPLIFIER SECTION
Rated distortion (Rated power level into 8 ohms, THD 20 Hz-20 kHz FL/C/FR) ≤0.1 %
(Rated power level into 8 ohms, THD 20 Hz-20 kHz SL/SR/BS) ≤0.1 %
Input Sensitivity (ref. 8 ohms, 1 kHz) 296 ±±
±±
±20 mV
S/N Ratio (A-wtd, 1kHz, 1 W, 8 ohm, SL/SR/BL) ≥≥
≥≥
≥- 75 dB
Frequency Response (20 Hz - 20 kHz) 0 ±±
±±
±1.0 dB
Channel Balance (1 dB to -40 dB, 1 kHz) ≤2 dB
(-41 dB to -50 dB, 1 kHz) ≤3 dB
Audio muting at 1 kHz ≥≥
≥≥
≥55 dB
Subwoofer out, 500 mV in (THD at 2 V O/P, 100 Hz) ≤0.5 %
Crosstalk (500 mV input, 10 W, 1 kHz) ≥≥
≥≥
≥-57 dB
Controls
Bass (at 500 mV in, 1 W out, 100 Hz) ±±
±±
±10 dB ±±
±±
±2 dB
Treble (at 500 mV in, 1 W out, 10 kHz) ±±
±±
±10 dB ±±
±±
±2 dB
DOLBY DIGITAL SECTION
Channel Difference (FL ref. Track 30) ±±
±±
±1.2 dB
Frequency Resporse at Dolby config.2 SL Track 46 200 - 20 kHz ±±
±±
±0.8 dB
SR Track 47 200 - 20 kHz ±±
±±
±0.8 dB
C Track 44 200 - 20 kHz ±±
±±
±0.8 dB
Harmonic Distortion (1 W, Audio LPF, Dolby Congfig 1) FL Track 65 997 Hz ≤0.08 %
FR Track 67 997 Hz ≤0.08 %
SL Track 68 997 Hz ≤0.08 %
SR Track 69 997 Hz ≤0.08 %
C Track 66 997 Hz ≤0.08 %
S/N Ratio (31 for O/P 1 W, Track 35) CCIR / ARM ≥≥
≥≥
≥65 dB
Audio LPF ≥≥
≥≥
≥70 dB
A-wtd ≥≥
≥≥
≥70 dB
Channel Separation (1 W, 20 kHz LPF) Track 65 997 Hz ≥≥
≥≥
≥60 dB
DOLBY PRO LOGIC II SECTION
Frequency Resporse
I/P mode : L, R : 1 V in, 1 W, Ch L/R 40 Hz 0 ±±
±±
±2.0 dB
20 Hz 0 ±±
±±
±2.0 dB
I/P mode : L=R : 1 V in, 1 W, Ch /L/R 40 Hz 0 ±±
±±
±2.0 dB
Ch C 20 kHz 0 ±±
±±
±2.0 dB
I/P mode : L=-R : 1 V in, 1 W, Ch SL/SR 40 Hz 0 ±±
±±
±2.0 dB
20 kHz 0 ±±
±±
±2.0 dB
S/N Ratio (200 mV in, 1 W, A-WTD w/ 1 k termination)
I/P mode : L, R : 1 kHz, Ch L/R ≥≥
≥≥
≥65 dB
I/P mode : L=R : 1 kHz, Ch C ≥≥
≥≥
≥65 dB
I/P mode : L=-R : 1 kHz, Ch SL/SR ≥≥
≥≥
≥65 dB
THD (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) ≤0.2 %

5
DTS SECTION
Output Level (Vol 0 dB) : FL/FR/C/SL/SR Track 6 1 kHz 0.3 ±±
±±
±1.3 W
Channel Difference (FL ref) : FL/FR/C/SL/SR Track 6 1 kHz ±±
±±
±1.0 dB
Harmonic Distortion (Audio Filter) : FL/FR/C/SL/SR Track 10-14 1 kHz ≤≤
≤≤
≤0.08 %
Frequency Response (20 Hz to 20 kHz) Track 26-30 +2/-1.5
Subwoofer Output Level 1 kHz ref at pre-out (FL) Play Track 10, charge to 15 12.5 ±±
±±
±1.5 dB
AM TUNER SECTION
Input level is expressed as the reading in open circuit
of 75-ohm source impedance signal generator
Usable sensitivity (999/1000 kHz) ≤≤
≤≤
≤30 dBµµ
µµ
µV
S/N Ratio (5 mV in) ≥≥
≥≥
≥38 dB
THD (5 mV in) ≤≤
≤≤
≤3 %
IF Rejection (450 kHz) ≤≤
≤≤
≤36 dB
Image Rejection (F+2xIF) ≥≥
≥≥
≥28 dB
Selectivity ≥≥
≥≥
≥17 dB
Output 170 -20/+30 mV
Loop sensitivity (20 dB S/N)
999/1000 kHz ≤≤
≤≤
≤66 dB
603/600 kHz ≤≤
≤≤
≤66 dB
1404/1400 kHz ≤≤
≤≤
≤66 dB
Frequency Response (100 - 2.3 kHz, 5 mV) ±±
±±
±6 dB
FM TUNER SECTION *C *AH
Input level is expressed as the reading in open circuit
of 75-ohm source impedance signal generator
Usable sensitivity (98 MHz) ≤≤
≤≤
≤15 dBµµ
µµ
µ≤≤
≤≤
≤15 dBµµ
µµ
µv
S/N Ratio (60 dB, IHF wtd) Mono ≥≥
≥≥
≥63 dB ≥≥
≥≥
≥63 dB
Stereo ≥≥
≥≥
≥63 dB ≥≥
≥≥
≥63 dB
Frequency Response (20 Hz - 15 kHz, 60 dBµµ
µµ
µ)0 ±±
±±
±1.5 dB 0 ±±
±±
±1.5 dB
Channel Separation (60 dBµµ
µµ
µ) 100 Hz ≥≥
≥≥
≥30 dB ≥≥
≥≥
≥30 dB
1 k ≥≥
≥≥
≥38 dB ≥≥
≥≥
≥38 dB
10 kHz ≥≥
≥≥
≥30 dB ≥≥
≥≥
≥30 dB
Alternate Channel Selectivity (40 dBµµ
µµ
µ, ±±
±±
±400 kHz) ≥≥
≥≥
≥60 dB ≥≥
≥≥
≥45 dB
Capture Ratio (40 dBµµ
µµ
µ)≤≤
≤≤
≤3 dB ≤≤
≤≤
≤3 dB
AM Suppression (60 dBµµ
µµ
µ, 100% Mod. FM, 30% Mod. AM) ≥≥
≥≥
≥48 dB ≥≥
≥≥
≥48 dB
Image Rejection (119.4 MHz) −−
−−
−≥≥
≥≥
≥65 dB
I.F. Rejection (10.7 MHz) ≥≥
≥≥
≥78 dB −−
−−
−
Pilot Suppression (98 MHz) ≥≥
≥≥
≥60 dB ≥≥
≥≥
≥60 dB
THD (60 dBµ, L=R 75 kHz for AH, 40 kHz Dev for C) Mono ≤≤
≤≤
≤0.25 % ≤≤
≤≤
≤0.25 %
Stereo ≤≤
≤≤
≤0.35 % ≤≤
≤≤
≤0.35 %
Auto-Search Sensitivity On ≥≥
≥≥
≥24 dBµµ
µµ
µ≥≥
≥≥
≥24 dBµµ
µµ
µ
Off ≤≤
≤≤
≤15 dBµµ
µµ
µ≤≤
≤≤
≤15 dBµµ
µµ
µ
RDS decode Sensitivity ≤≤
≤≤
≤26 dBµµ
µµ
µ−−
−−
−
PHYSICAL SPECIFICATIONS
Dimensions (Width x Height x Depth) 435 x 170 x 423 mm
Net Weight 20.50 Kg (45.10 lbs)
Shipping Weight 24.0 Kg (52.80 lbs)

6
FRONT PANEL
REAR PANEL / FRONT PANEL VIEW
REAR PANEL
1. FM &AMANTENNA
2. SOFTCLIPPING ON/OFF
3. MONITOR OUT
4. CD INPUT
5. IR INPUT & OUTPUT
6. +12V TRIGGER INPUT & OUTPUT
7. COMPONENT VIDEO IN &
COMPONENT VIDEO OUT
8. DIGITALAUDIO INPUT &
DIGITALAUDIO OUTPUT
9. POWER SWITCH
10. SWITCHEDAC OUTLETS
11. AC POWER INLET
12. SPEAKERSA& B
13. DVD, SAT, VCR, VIDEO 4 & VIDEO 5
14. MAIN IN /AUDIO PRE-OUTS /
SUBWOOFER OUT
15. TAPE INPUT & OUTPUT
16. MS OUT (MULTISOURCE OUT)
17. 7.1 CH. INPUTS
1. STANDBY SWITCH
2. STANDBY LED
3. AM / FM
4. FM MUTE / MODE
5. DISPLAY
6. MEMORY
7. PRESET DOWN / UP
8. SEARCH DOWN / UP
9. VFL DISPLAY
10. VOLUME (SETUP)
11. SOURCE DOWN / UP
12. SURROUND MODE
13. LEVELS
14. TONE DEFEAT
15. TONE CONTROLS
16. SPEAKERSA& B
17. VIDEO 6 INPUT
18. PHONES

7
DISASSEMBLY INSTRUCTIONS
1. Remove machine screws M4.0 x 8.0 (1to 6) from the side panels.
Remove tapping screw 3.0 x 8.0 (7to 10) from the back panel.
Refer to Figure No. 1.
2. Pull both sides of the TOP COVER slightly outwards 11 and tilt approx. 35 ° and then
remove in the direction as indicated by the arrow 12. Refer to Figure No. 2.
Figure No. 1
Figure No. 2

8
WIRING DIAGRAM
KEYBOARD
MAIN BOARD
TRIGGER BOARD
POWER SWITCH
BOARD
J8101B
J713A J714A
J715A
J719A
J720A
J717A
J710A
J711A
J712A
J707A
J704A
J502B
J709A
J713B J714B
J203A
J204B
J901B
J753B
VIDEO 6 INPUT BOARD
J758B
J757B
J709B
DSP BOARD
J604B J715B
J1009B J1010B
LED BOARD
PSU BOARD
COMPONENT VIDEO
DIGITAL BOARD
AUDIO BOARD
VIDEO BOARD
SPEAKER A
SPEAKER B
J1009A
J1010A
RS232 BOARD
TUNER
PRE-OUT BOARD MULTI-CHANNEL
J717B
J611A J612A
J6101B
J6101A
J719B
J6104A
J708B
J707B
J350A
J414B
J710B
J711B J712B
J414A
SECONDARY BOARD
ISC BOARD
J801A
J781A
J782A J582A
J801B
J783A1 J511B
J704B
J3103A
S-VIDEO BOARD
AMP 2 BOARD
(SURROUND AMP.)
AMP 1 BOARD
(FRONT & CENTER)
J612B
J502A J503A
M506
J511A
J581A
J781B
J503B
J611B
J801A
J901A
J753A
J754B
J751B
J504A
J501A
J757 J756
J761_N J761_L
J760
J758
J759
J203B
J803A
J3103B
J6102B J6103B
J6102A
J6103A
J201
J204A
J6106A J6105A
J350B
J6106A J6105A
J8101A
J784A
J803B
J504B1
J504B3
J582A1
J582A3 J582A5
J501B1
J501B3 J501B5
J582A1
J582A3 J582A5
J701
J782A1
J782A2 J782A3
P4402
J581B
THERM SENSNOR
THERM SENSNOR
TO MAIN BOARD
TO MAIN BOARD
TO MAIN BOARD
TO MAIN BOARD
TO MAIN BOARD
82-0426135-01-XX CABLE ASSY 4 WAYS #26
FROM TRANSFORMER
UL VERSION :
USE J758, J759
CE VERSION :
USE J760
MOUNT ON CHASSIS GND
33
34
35
36
32
37 38
39
31
15
30
29
28
27
2625
24
23
19
20
17
16
14
13
1211
10
8
9
21
7
6
5
4
3
2
1
18
22

9
WIRING DIAGRAM PARTS LIST
Item Database Part Number Description Remark
1 17-012-2986-90 CABLE ASSY 2 WAYS AWG=26 2.5P UL2468
L=440mm AMP1 BD-J511A
2 17-012-2987-90 CABLE ASSY 4 WAYS AWG=18 3.96P UL1007
L=420mm AMP1 BD-J581A
3 17-012-2988-90 CABLE ASSY 6 WAYS AWG=26 2.5P UL1007
L=320mm AMP1 BD-J503A
4 17-012-2989-90 CABLE ASSY 4 WAYS AWG=18 3.96P UL1007
L=200mm REV.B AMP2 BD-J781B
5 17-012-2966-90 CABLE ASSY 4 WAYS AWG26 2.5P UL1533 L=450MM AUDIO BD-
J3103A
6 17-012-2957-90 CABLE ASSY 2 WAYS AWG=26 2.5P UL1533
L=540mm
DIGIT BD-
J1009A
7 17-012-2990-90 CABLE ASSY 4 WAYS AWG=26 2.5P UL2468
L=540mm
DIGITAL BD-
J1010A
8 17-012-2956-90 CABLE ASSY 1 WAY AWG18 UL1007 BLACK
L=100mm W/ RING TERMINAL
KEYBOARD-
J201
9 17-012-3404-90 CABLE ASSY 5 WAYS AWG26 2.5P UL1007 L=160mm LED BD-J204A
10 17-012-2991-90 CABLE ASSY 1 WAY AWG=18 UL1007 BLACK
L=360mm W/ RING TERMINAL MAIN BD-J701
11 17-012-2963-90 CABLE ASSY 3 WAYS AWG=26 2.5P L=110mm MAIN BD-
J6106B
12 17-012-2992-90 CABLE ASSY 3 WAYS AWG=26 2.5P L=60mm MAIN BD-
J6105B
13 17-012-2964-90 CABLE ASSY 3 WAYS AWG26X2C UL2547 L=210mm MAIN BD-J715A
14 17-012-2974-90 CABLE ASSY 8 WAYS AWG=26X3C L=480mm MAIN BD-J709A
15 17-012-2993-90 CABLE ASSY 10 WAYS AWG26 2.5P UL1007 L=460mm MA BD-J350B
16 17-012-2977-90 CABLE ASSY 12 WAYS AWG26 2.5P UL2468 L=230mm MA BD-J502B
17 17-012-2994-90 CABLE ASSY 14 WAYS #26 2.5P UL1007 L=540mm MA BD-J8101B
18 17-012-2960-90 CABLE ASSY 3 WAYS AWG=18 3.96P UL1015
L=320mm
SPK BD-J782B1,
J782B2,J782B3
19 17-012-2995-90 CABLE ASSY 3 WAYS AWG=18 3.96P UL1015
L=350mm
SPK BD-J582B1,
J582B2,J582B3
20 17-012-2996-90 CABLE ASSY 5 WAYS AWG=18 3.96P UL1007
L=250mm (V/BL/Y)
SPK BD-J801B1,
J801B3,J801B5
21 17-012-2997-90 CABLE ASSY 5 WAYS AWG=18 3.96P UL1007
L=120mm (BR/R/O)
SPK BD-J501B1,
J501B3,J501B5
22 17-012-2998-90 CABLE ASSY 3 WAYS AWG=18 3.96P UL1015
L=240mm
SPK BD-J504B1,
J504B3
23 17-012-2972-90 CABEL ASSY 6 WAYS AWG=26 2.5P UL1533X1C
L=350mm PO BD-J612A

10
Item Database Part Number Description Remark
24 17-012-2999-90 CABLE ASSY 6 WAYS AWG=26 2.5P UL 1533X1C
L=540mm PO BD-J611A
25 17-012-2948-90 CABLE ASSY 1 WAY AWG=16 UL1672 BROWN
L=100mm PS BD-J757
26 17-012-2874-90 CABLE ASSY 1 WAY AWG=16 UL1672 BLUE L=100mm PS BD-J756
27 17-012-2965-90 CABLE ASSY 4 WAYS AWG26 2.5P UL2468 L=400mm PS BD-J753A
28 17-012-3000-90 CABLE ASSY 2 WAYS AWG=18 UL1007 L=170MM SE BD-J803A
29 17-012-3001-90 CABLE ASSY 6 WAYS #18 3.96P UL1007 L=150MM SE BD-J801A
30 17-012-2973-90 CABLE ASSY 8 WAYS AWG=26 2.5P UL1007
L=380mm SV BD-J414A
31 17-012-2956-90 CABLE ASSY 1 WAY AWG18 UL1007 BLACK
L=100mm W/ RING TERMINAL V6 BD-P4402
32 17-010-0032-90 FFC CABLE 30 PINS P1.25 L=70mm W/SHIELD
J601C
33 17-010-0033-90 FFC CABLE 17 PINS P1.25 L=200mm W/ SHIELD
J720C
34 17-010-0038-90 FFC CABLE 20 PINS P1.25 L=160mm W/ SHIELD J604C
35 17-010-0039-90 FFC CABLE 28 PINS P1.25 L=170mm W/ SHIELD J602C,J603C
36 17-010-0040-90 FFC CABLE 30 PINS P1.25 L=220mm W/ SHIELD J713C,J714C
37 17-012-2875-90 CABLE ASSY 1 WAY AWG=16 UL 1015
GREEN/YELLOW L=100mm 1-CHASSIS GND
38 17-012-2948-90 CABLE ASSY 1 WAY AWG=16 UL1672 BROWN
L=100mm
1-INLET/PSU.BD
(L),J759
39 17-012-2874-90 CABLE ASSY 1 WAY AWG=16 UL1672 BLUE L=100mm 1-INLET/
PSU.BD,J758

11
BLOCK DIAGRAM
SELECTOR
IN
AUDIO
IN/OUT
TRIGGER
HCF4094
MATRIX
CD
TUNER
KEY
IR
IN
VOLUME
ENCODE
V4
V6
V5
V1
V2
V3
IN
Ex SUB
V3
OUT
V4
OUT
IN
IN
IN
Ex SURR
Ex CEN
Ex BSURR
24C16
EEPROM RST IC
TCM810
MUTE
MUTE
OUT
MS AUDIO
AMP
POWER
MUTE
MUTE
MUTE
MUTE
AMP
POWER
PRE-OUT
SPK
RELAY
RELAY
OU
T
SPK
OU
T
SPK
RELAY
RELAY
(A)
OU
T
OU
T
SPK
RELAY OU
T
SPK
(B)
M61516
VOLUME /
SELECTOR
ELECT
AUDIO
M61516
VFD PT6306
VFD DRIVER
CPU
T89C51RD2
DATACLK
MSR
MSL
SR
SL
BSL
BSR
BSL
C
FR
FL
FR
C
FL
BSR
FR
C
BSL
FL
SR
SL
BSL
FL
FR
C
FR
FL
SHIFT REGISTERS
HCF4094
ARRAY OF
T89C51RD2
CPU
74VHC
245
4051
CS49326
M61516
LC74763
CS8415A
CS4228
CS4340
74HC
(COMPOSITE/S)
(COMPONENT)
DIR
IN
OUT
IN
TAPE
Ex FRONT
TAPE
OPT IN
74HC157
C
CS4340
96/24
D/A
96/24
CS4228
D/A
CPU
74HC251
OUT
COAX IN
COAX / OPT
CPU
CS-8415
CS
CPU
CDOUT
RESET
CCLK
CDIN
CPU
CS-49326
74HC574
256k x8
W27C02
EPROM
CPU
MUTE
MUTE
IN
EXT 7.1
IN
VIDEO
IN
VIDEO
CPU
(COMPONENT)
VIDEO OUT
MON OUT
CPU
V4 OUT
V3 OUT
DSP SECTION
BSR
VOLUME /
SSRSL FRBSL
ELECT
AUDIO
FL
SHIFTER
74HC245
LEVEL
RE-DIRECT
BASS
SHIFTER SHIFTER
74HC245 74HC245
DSP
RESET
CS
CDOUT
CDIN
CCLK
CPU
INTREG
LEVEL LEVEL
A17
A16
A15
CPU
SR
SUB
SL
SR
SL
SUB
74HC00 74HC04
V1
V2
74HC4052
MULTI-
PLEXER
75 OHM
DRIVER
BA7660FS
OSD
LC74763
V3
V4
V6
V5
V1
V2
VIDEO
SELECTOR
74HC4051

12
SPECIAL FUNCTION
FEATURE KEYS PRESS ON FRONT PANEL
RESET FOR AH VERSION VIDEO 6 +SOURCE UP
RESET FOR C VERSION VIDEO 6 + SOURCE DOWN
NTSC / PAL SELECTION VIDEO + MEMORY
VFD ALL DISPLAY AUDIO 6 + TONE DEFEAT
AM FREQ. STEP AM/FM + FM MUTE
DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING
M6759(U202) main clock is at 20MHz(X202)
M6759(U201) main clock is at 20MHz(X201)
UPPER - +5V supply to KEYBOARD when power up
LOWER - RESET line (TCM810LENB713) when
power up
UPPER - OUTPUT ENABLE(pin 24) of EPROM
(W27C02) when changing SURROUND MODES
LOWER - CHIP ENABLE(pin 22) of EPROM
(W27C02) when changing SURROUND MODES
SCLK (pin 43 of CS49326)
LRCLK (pin 42 of CS49326)
MCLK (pin 30 of CS49326)
NOTE: The waveforms are based on software version V2.10.

13
AMPLIFIER ADJUSTMENT
Idle Current
1. Rotate R522 fully clockwise.
2. Connect DC millivoltmeter to P501 (i.e. Across half of R523, 0.22 Ohm resistor).
3. Turn on the unit.
4. Adjust R522 for 1mV reading on voltmeter.
5. Leave power on for at least 5 min, and check for idle current again.
6. Repeat for other channels.
CHANNEL JUMPER VR
FL P501 R522
FR P502 R545
C P503 R571
SL P801 R835
SR P802 R836
BS P803 R897
ISC Sensitivity
1. Connect 8 ohm loading to all channels.
2. Rotate R881 fully clockwise.
3. Load all channels at full power using 1kHz sine wave.
4. At this time, monitor the THD of the SL,SR,BS output. Clipping should occur before full power
achieved.
5. Rotate R834 counter-clockwise slowly until the THD just below 0.1%.
6. Repeat step 2-5 for R834 but monitor FL, FR & Center output.
7. The procedure is finish at this step.
8. Load all channels at full power using 1kHz sine wave with 4 ohm load.
9. The clipping power(at THD 0.1%) should less than 85W.
ADJUSTMENT POINT DIAGRAM
R522 R545 R571
P501
P502 P503
P803
P802P801
R835 R836 R897
R881
FRONT / CENTER AMPLIFIER BOARD
SURROUND AMPLIFIER BOARD
SECONDARY / ISC BOARD

14
PCB LAYOUT
AUDIO BOARD
POWER SUPPLY (STANDBY) BOARD

15
COMPONENT VIDEO BOARD - COMPONENT SIDE
COMPONENT VIDEO BOARD - COPPER SIDE
DIGITAL BOARD - COMPONENT SIDE SIDE
DIGITAL BOARD - COPPER SIDE

16
DSP BOARD - COPPER SIDE
DSP BOARD - COMPONENT SIDE

17
FRONT / CENTER AMPLIFIER BOARD - COMPONENT SIDE

18
FRONT / CENTER AMPLIFIER BOARD - COPPER SIDE

19
SURROUND AMPLIFIER BOARD - COMPONENT SIDE

20
SURROUND AMPLIFIER BOARD - COPPER SIDE